A sensing and dispensing system for dispensing a first liquid to a reservoir, the dispenser comprising a pumping device having an inlet adapted to receive said liquid and an outlet adapted to be placed in communication with the reservoir and a control mechanism controlling operation of the pumping device...http://www.google.com.tw/patents/US4076146?utm_source=gb-gplus-share專利 US4076146 - Dishwashers and detergent dispensers
